Body surface area (BSA) is the calculated surface area of the human body. BSA is often used for medical purposes over bodyweight because it can provide a clearer evaluation of the body requirement for energy (metabolic mass).

Since it is difficult to obtain body surface area through direct measurement it is usually determined via a mathematical formula. There are several BSA formulas the most popular was published by D Du Bois and E F Du Bois in 1916 and provides an estimate of the approximate surface area if height and weight are known.

The Du Bois formula is shown below where BSA is in meter2, height is in centimetres and weight is in kilograms:

BSA = 0.007184 * Height^{0.725}* Weight^{0.425}

This calculator uses the above Du Bois formula to provide body surface area calculation.

Here are some other BSA formulas:

### Mosteller formula:

BSA = = 0.016667 × W^{0.5}× H^{0.5}

### Haycock formula:

BSA = 0.024265 × W^{0.5378}× H^{0.3964}

### Gehan and George formula:

BSA = 0.0235 × W^{0.51456}× H^{0.42246}

### Boyd formula:

BSA = 0.03330 × W^{(0.6157 - 0.0188 × log10(W))}× H^{0.3}

### Fujimoto formula:

BSA = 0.008883 × W^{0.444}× H^{0.663}

### Takahira formula:

BSA = 0.007241 × W^{0.425}× H^{0.725}

### Schlich formula:

Women BSA = 0.000975482 × W^{0.46}× H^{1.08}Men BSA = 0.000579479 × W^{0.38}× H^{1.24}

## Mean Male BSA:

Age or age group | metric | imperial | ||
---|---|---|---|---|

Neonate (newborn) | 0.243 | m^{2} |
2.612 | ft^{2} |

2 years | 0.563 | m^{2} |
6.060 | ft^{2} |

5 years | 0.787 | m^{2} |
8.471 | ft^{2} |

10 years | 1.236 | m^{2} |
13.304 | ft^{2} |

13 years | 1.603 | m^{2} |
17.255 | ft^{2} |

18 years | 1.980 | m^{2} |
21.313 | ft^{2} |

20–79 years | 2.060 | m^{2} |
22.173 | ft^{2} |

80+ years | 1.920 | m^{2} |
20.667 | ft^{2} |

## Mean Female BSA:

Age or age group | metric | imperial | ||
---|---|---|---|---|

Neonate (newborn) | 0.234 | m^{2} |
2.519 | ft^{2} |

2 years | 0.540 | m^{2} |
5.813 | ft^{2} |

5 years | 0.771 | m^{2} |
8.299 | ft^{2} |

10 years | 1.245 | m^{2} |
13.401 | ft^{2} |

13 years | 1.550 | m^{2} |
16.684 | ft^{2} |

18 years | 1.726 | m^{2} |
18.579 | ft^{2} |

20–79 years | 1.830 | m^{2} |
19.697 | ft^{2} |

80+ years | 1.638 | m^{2} |
17.631 | ft^{2} |

You may also be interested in our BMI calculator.